Warburg impedance

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The Warburg impedance , also called Warburg element or Warburg impedance element, is an element in an equivalent circuit diagram that is used to describe electrochemical systems . It describes a contribution to the alternating current resistance ( impedance ) that arises through diffusion to and from an electrode. This diffusion-related impedance contribution is examined with the help of electrochemical impedance spectroscopy . It is named after Emil Warburg , who published the theoretical description in 1899, which also contained the phase angle of 45 ° (π / 4). Elsa Neumann provided the experimental data that confirmed the theory.

Individual evidence

  1. ^ Emil Gabriel Warburg: About the behavior of so-called non-polarizable electrodes against alternating current . In: Gustav Heinrich Wiedemann and Eilhard Wiedemann (Hrsg.): Annals of Physics and Chemistry . New episode 67 ( Annalen der Physik. Volume 303 ), no. 3 . Publisher by Johann Ambrosius Barth, Leipzig 1899, chap. 1 , p. 493–499 , doi : 10.1002 / andp.18993030302 ( Internet Archive [accessed on August 15, 2015] from the Thuringian University and State Library Jena (ThULB) ).
  2. ^ Elsa Neumann: About the polarization capacity of reversible electrodes . In: Gustav Heinrich Wiedemann and Eilhard Wiedemann (Hrsg.): Annals of Physics and Chemistry . New episode 67 ( Annalen der Physik. Volume 303 ), no. 3 . Publisher by Johann Ambrosius Barth, Leipzig 1899, chap. 2 , p. 500–534 , doi : 10.1002 / andp.18993030303 ( Internet Archive [accessed on August 15, 2015] from the Thuringian University and State Library Jena (ThULB) ).